Add Goerli and Sepolia to the API list
Add Goerli and Sepolia to the API list

Hey @sebs 

Thanks a lot for this amazing library.

I created this PR to include the Sepolia and Goerli API endpoints. Currently I'm creating the client (with `axios.create`) to support those two, but I'd be cool if I have directly included on the library.

Thanks!
sebs/etherscan-api